JIS Spiral Fluted Taps (for blind hole)Spiral Fluted Taps(for through hole)Spiral Pointed Taps(for through hole)Hand TapsCementedCarbide TapsRoll TapsSpecial Thread TapsSimple Inspection ToolsPipe TapsThread MillsPremium Thread MillsDiesCenter DrillsCentering Tools Special Thread Taps / Simple Inspection Tools Overall Thread Thread + Neck Shank Shank Size of Length oflengthlengthlengthlengthdia.squaresquareLℓℓnℓsDsKℓk⑦ JIS HT CTC ① Hand Taps for Steel Conduit Threads ② Specification ■Tap for steel conduit threads. Thread angle is 80 degree and the thread symbol is CTC. ③ Recommended Tapping Speeds depending on Materials Low carbon steels Medium carbon steels High carbon steels 低炭素鋼 中炭素鋼 高炭素鋼 〜10 〜10 〜10 (m/min) (m/min) (m/min) ④ TYPE:1 ⑤ Segment:1A Size Code BasicChamfermajor dia(mm)L(mm)ℓ(mm) ℓn(mm) ℓs(mm) Ds(mm) K(mm) ℓk(mm) No. offlutesTYPE MSRP ⑥ For Steel Conduit Threads CTC19-16 TYCC190HEB5 5P 19.100 105 23 - 50 15 12 15 4 1 ¥14,500 □ CTC25-16 TYCC250HEB5 5P 25.400 125 24 - 58 19 15 18 4 1 ¥31,700 □ CTC31-16 TYCC310HEB5 5P 31.800 145 26 - 67 24 19 22 4 1 ¥45,800 □ ⑦ CTC39-16 TYCC390HEB5 5P 38.100 165 27 - 76 30 23 26 4 1 ¥61,100 □ ■ For Steel Conduit Threads unit: mm ■ Bored hole size unit: mm ⑧ Pitch Diameter Minor DiameterSize Size Minor Diameter of Internal Thread(D1)Bored Hole SizeMax.Min.(Reference) Basic Size Basic Size CTC 19 - 16 18.208 17.808 18.11 CTC 19 - 16 18.343 17.708 CTC 25 - 16 24.508 24.108 24.41 CTC 25 - 16 24.643 24.008CTC31 - 1631.04330.408 CTC 31 - 16 30.908 30.508 30.81CTC39-1637.20836.80837.11 ⑨ CTC 39 - 16 37.343 36.708 ⑩ ⑪ JIS ※ = Specified Distribution Items. Made to order products. □=In stock at manufacturer. ⑦-36